BACON 



to the hand. It is said, however, of Constantius, and some others of a 

 very dry constitution and habit of body, that when attacked with 

 violent fevers, they became so warm as to appear almost to burn the 

 hand applied to them. . 



IX. Animals become more warm by motion and exercise, wine ana 

 feasting, venery, burning fevers, and grief. 



X In the paroxysm of intermittent fevers the patients are at first 

 seized with cold and shivering, but soon afterwards become more 

 heated than at first in burning and pestilential fevers they are hot 

 from the beginning. 



XL Let further inquiry be made into the comparative heat of differ- 

 ent animals, as fishes, quadrupeds, serpents, birds, and also of the 

 different species, as the lion, the kite, or man; for, according to the 

 vulgar opinion, fishes are the least warm internally, and birds the most, 

 particularly doves, hawks, and ostriches. 



XII. Let further inquiry be made as to the comparative heat in dif- 

 ferent parts and limbs of the same animal; for milk, blood, seed, and 

 eggs are moderately warm, and less hot than the outward flesh of the 

 animal when in motion or agitated. The degree of heat of the brain, 

 stomach, heart, and the rest, has not yet been equally well investi- 

 gated. 



XIII. All animals are externally cold in winter and cold weather, 

 but are thought to be internally warmer. 



XIV. The heat of the heavenly bodies, even in the warmest climates 

 and seasons, never reaches such a pitch as to light or burn the driest 

 wood or straw, or even tinder without the aid of burning-glasses. It 

 can, however, raise vapor from moist substances. 



XV. Astronomers tell us that some stars are hotter than others. 

 Mars is considered the warmest after the Sun, then Jupiter, then Venus. 

 The Moon and, above all, Saturn, are considered to be cold. Among 

 the fixed stars Sirius is thought the warmest, then Cor Leonis or Regu- 

 lus, then the lesser Dog-star. 



XVI. The sun gives out more heat as it approaches towards the 

 perpendicular or zenith, which may be supposed to be the case with 

 the other planets, according to their degree of heat; for instance, that 

 Jupiter gives out more heat when situated beneath Cancer or Leo 

 than when he is beneath Capricorn and Aquarius. 



XVII. It is to be supposed that the sun and other planets give more 

 heat in perigee, from their approximation to the earth, than when in 

 apogee. But if in any country the sun should be both in its perigee and 

 nearer to the perpendicular at the same time, it must necessarily give out 

 more heat than in a country where it is also in perigee, but situated 

 more obliquely; so that the comparative altitude of the planets should 

 be observed, and their approach to or declination from the perpen- 

 dicular in different countries. 



XVIII. The sun and other planets are thought also to give out more 

 heat in proportion as they are nearer to the larger fixed stars, as when 

 the sun is in Leo he is nearer Cor Leonis, Cauda Leonis, Spica Vir- 

 ginis, Sirius, and the lesser Dog-star, than when he is in Cancer, 

 where, however, he approaches nearer to the perpendicular. It is 

 probable, also, that the quarters of the heavens produce a greater heat 

 (though not perceptibly), in proportion as they are adorned with a 

 greater number of stars, particularly those of the first magnitude. 



m XIX. On the whole, the heat of the heavenly bodies is augmented 

 in three ways: I. The approach to the perpendicular; 2. Proximity or 

 their perigee; 3. The conjunction or union of stars. 



XX. There is a very considerable difference between the degree of 

 heat in animals, and even in the rays of the heavenly bodies (as they 



